Abstract
Circumferential magnetic properties of amorphous magnetic wires (a-wires, for short) with three kinds of compositions (FeSiB, CoSiB, and FeCoSiB) and diameters of 120 mu m and 50 mu m are investigated applying an AC current using a BH hysteresis tracer. The magnitude of the induced voltage between both ends of the a-wire is decided by a differential permeability regarding circumferential flux change which is considered to occur principally in the outer shell of a-wires. A sensitive magneto-inductive (MI) effect is found in a-wires, in which the value of the inductance of a zero-magnetostrictive a-wire of 5 mm length changes up to about 75% for an external field of 0.8 kA/m (10 Oe). This MI effect is shown to be applicable to small magnetic heads and a cordless data tablet. >
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